Gateway 3DS card is compatible with 3DS/3DS XL/LL firmware Version from 4.1.0-8 to 4.5.0-10. You can check the system version of your 3DS. If you 3DS firmware ver. is 4.5.0-10, 4.4.0-10, 4.3.0-10, 4.2.0-9 or 4.1.0-8 on US,EU,AU,JP etc., you can choose to order or buy Gateway 3DS cards to play 3DS games. Here we suggest a trustworthy online store, the official reseller www.dwtechz.com.
However, if your 3DS firmware is 4.0.0-7, 3.0.0-6, 2.2.0, 2.1.0-4, 2.0.0-2, 1.1.0-1, 1.1.0-0, you should update it to 4.x if you want to play 3DS roms with Gateway 3DS flashcard. Pay attention that you should not update it directly as it will be updated to V 6.2.0. You should download a 3DS game on version 4.1—4.5, such as Luigi’s Mansion (ver. 4.5), to update your 3DS console.
If you 3DS system is 5.x—6.2.0, we are afraid that you can not use the Gateway 3DS cartridge at present. Even though the blue gateway cart can be compatible with 3DS 6.1.0, but it is actually an R4i card, which can only load DS games. At this point, you can choose other cheap and popular flascharts, R4i gold 3DS card, Supercard DStwo are good choices.